Datasheet Texas Instruments UC2845AD8TR — 数据表

制造商Texas Instruments
系列UC2845A
零件号UC2845AD8TR
Datasheet Texas Instruments UC2845AD8TR

电流模式PWM控制器8-SOIC -40至85

数据表

UCx84xA Current-Mode PWM Controller datasheet
PDF, 2.1 Mb, 修订版: E, 档案已发布: Jul 25, 2016
从文件中提取

价格

状态

Lifecycle StatusActive (Recommended for new designs)
Manufacture's Sample AvailabilityNo

打包

Pin888
Package TypeDDD
Industry STD TermSOICSOICSOIC
JEDEC CodeR-PDSO-GR-PDSO-GR-PDSO-G
Package QTY250025002500
CarrierLARGE T&RLARGE T&RLARGE T&R
Device MarkingUC2845UC2845AAD8
Width (mm)3.913.913.91
Length (mm)4.94.94.9
Thickness (mm)1.581.581.58
Pitch (mm)1.271.271.27
Max Height (mm)1.751.751.75
Mechanical Data下载下载下载

参数化

Control MethodPeak Current Mode
Duty Cycle(Max)50 %
Frequency(Max)500 kHz
Frequency(Min)26 kHz
Gate Drive(Typ)1 A
Operating Temperature Range-40 to 85 C
Package GroupSOIC
RatingCatalog
Special FeaturesError Amplifier,Multi-topology
TopologyBoost,Buck,Flyback,Forward
UVLO Thresholds On/Off8.4/7.6 V
Vin(Max)400 V
Vin(Min)8.4 V

生态计划

RoHSCompliant

应用须知

  • DN-30 Programmable Electronic Circuit Breaker
    PDF, 164 Kb, 档案已发布: Sep 5, 1999
    This design note describes a programmable electronic circuit breaker that uses the UC3843A control IC to facilitate a high-speed turnoff following an overcurrent condition. This low-cost industry-standard IC contains the required protection features and drive capability in a single 8-pin device.
  • DN-29 UC3842A Family - Frequency Foldback Technique Provides Protection
    PDF, 51 Kb, 档案已发布: Sep 5, 1999
    Excessive power dissipation can occur in switch-mode power supplies during startup and overload conditions. Many sophisticated PWM controllers provide the means for protection against these problems; however simple low-cost controllers require additional circuitry. This design note describes a circuit that uses only one additional resistor and transistor to enhance the performance of the UC3842A
  • DN-26 UC3842A Low-Cost Start-up and Fault Protection Circuit
    PDF, 155 Kb, 档案已发布: Sep 5, 1999
    The UC1842/3/4/5 family of control ICs can implement off-line or DC-to-DC fixed-frequency current-mode control schemes with a minimal external parts count. This design note describes a circuit with low startup current (less than 0.5mA) MOSFET-compatible undervoltage lockout thresholds programmable restart-delay HICCUP fault protection auxiliary 5V precision reference and overvoltage/overtemper
  • DN-27 UC1842/UC1842A Family - Summary of Functional Differences
    PDF, 21 Kb, 档案已发布: Sep 5, 1999
    The UC1842A/3A/4A/5A family of control ICs is a pin-for-pin compatible improved version of the UC3842/3/4/5 family. Providing the necessary features to control current-mode switched-mode power supplies this device has been improved for higher frequency off-line power supplies. This new A series of controllers UC1842A/43A/44A/45A is superior to its predecessors in startup current requirements
  • DN-40 The Effects of Oscillator Discharge Current Variations on Maximum Duty
    PDF, 39 Kb, 档案已发布: Sep 5, 1999
    This design note details programming frequency and maximum duty cycle using the UC3842 and UC3842-A PWM oscillator ICs. Simplified equations are used to develop obtainable ranges for parameters over IC tolerances.
  • UCC38C42 Family of High-Speed BiCMOS Current-Mode PWM Controllers
    PDF, 280 Kb, 档案已发布: Feb 7, 2002
    Since their introduction in the mid 1980?s the bipolar UC3842 family of Pulse width modulation (PWM)controllers has grown to become the most widely-used control strategy in the power supply industry. [1] The reasons for success are quite clear the devices feature an elegantly simple yet very effective control architecture they use only 8 pins they can drive MOSFET gates directly and they offer
  • U-111 Practical Considerations in Current Mode Power Supplies
    PDF, 787 Kb, 档案已发布: Sep 5, 1999
    This application note explains the numerous PWM functions and ways to maximize their usefulness. It covers practical circuit design considerations such as slope compensation gate drive circuitry external control functions synchronization and paralleling current-mode controlled modules. Circuit diagrams and simplified equations are included.
  • DN-42A Design Considerations for Transitioning from UC3842 to the New UCC3802
    PDF, 42 Kb, 档案已发布: Sep 5, 1999
    The UCC3802 offers numerous advantages that allow the power supply design engineer to meet requirements for lower power for battery-operated equipment higher switching frequencies for reduced magnetics size higher levels of circuit integration for improved reliability and lower cost. The UCC3802 family of devices is pin-out compatible with the UC3842 and UC3842A families; however it is not plu
  • Conditioning a Switch-mode Power Supply Current Signal Using TI Op Amps
    PDF, 61 Kb, 档案已发布: Mar 23, 2000
    The switch-mode power supply primary current is often sensed using a power resistor. Using an op amp to amplify the current-sense signal can reduce cost and improve noise performance and efficiency. This report reviews the advantages of using an op amp circuit and analyzes the design criteria needed to choose the proper op amp.
  • Understanding Buck-Boost Power Stages in Switchmode Power Supplies (Rev. A)
    PDF, 363 Kb, 修订版: A, 档案已发布: May 28, 2002

模型线

制造商分类

  • Semiconductors > Power Management > Offline and Isolated DC/DC Controllers and Converters > PWM and Resonant Controller